I agree in general, but conversely my worst ever punt was with a Romanian who i thought i'd spoken to over the phone. In reality she had a madam answer the phone who was one of the nicest people i've ever spoken to! Asking whereabouts i lived, saying "oh yeah, i know the area" etc etc, asking if i'd had a nice weekend....
Then i turn up to the punt and some dog rough Romanian who spoke hardly any English and looked like a smackhead proceeded to go through the motions. I remember she had really cold skin.......ew.
Anyway, i agree that phone calls are important but its not always the WG you'll be speaking to.